Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d203d3a758c0d0…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 17:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eddbfe87ed18d3809a69023e24e2dd52 SHA-1: 8c36089c1e248ba403cb41b7ddb6d76c65c4f546 SHA-256: 61d203d3a758c0d0bd912a3f169f3e29e7373561338ade7728d6614a58bf0098
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://festacontinua.it/public/file/wukijonoziromum.pdf In PDF document text
    • https://truckforceone.eu/upload/editor/file/22706757114.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/14910833898.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210906043853.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/fuliwexagixoler.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/57891334355.pdfIn PDF document text
    • https://keongracun.org/contents/files/ronumugewavugenolovinaja.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/56030104562.pdfIn PDF document text
    • https://deepex.hu/hirek/files/75014696831.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/35790799792.pdfIn PDF document text
    • http://keitbg.com/images/files/12956181814.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614517a9a21ee---17243866422.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/vitewivozibajulugoj.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/12701145434.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/69f8ef30297af355ddfabeccdb32b0e6/18280892287.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/butatinusipokumuto.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091617020499.pdfIn PDF document text
    • http://sooclose.eu/upload/File/latefajajaguneboko.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/83998157923.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/78509863869.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc68d638de---waxamadoloximezojisugow.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161436047cd350---dajosumuvi.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=descargar+pacman+para+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AB 2064 bytes
SHA-256: 46b41152c66239606199adeeb56fa6f0c95586cce1373289504480bb8e1ff93d
font_01_sfnt_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 10712 bytes
SHA-256: 8b1b578de0c24e7c7e9f37dec3596eb18e348678e9c3d13ddcda3ee043698caa
font_02_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 14660 bytes
SHA-256: c96bee89bb90137fa0e1e8f9a279457ef342fe93556b595e1e12f312220955d3
font_03_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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